Changing from two stoke to four stroke question

[mctaggart]

Hello

I am considering changing my current 2000 Mercury 75hp two stroke, (on my 5.4 metre ribtec) for a four stroke, purely because of the limiting factor of the amount of fuel it guzzles and the distance i wish to now go on it. It currently gets about 1.2miles per litre, however I am told i can expect to get double that on a more modern four stroke.

I have seen a 2004 Honda BF75 for sale for £1900 and it seems like it will be a straight swap with any luck. I was under the impression all the newish four strokes were fuel injected, but i am reading that this Honda may have carbs??

Can anyone shed any more light on this?

if it all checks out I am going to change to 4 stroke

Craig

[Mollers]

Originally Posted by mctaggart

. It currently gets about 1.2miles per litre, however I am told i can expect to get double that on a more modern four stroke.



Craig

They lied.

1.2m/ltr is good going and a 75hp 4st would struggle to do much better. Hang on to your money and put it towards upgrading the whole rig when the time comes. Re-powering rarely stacks-up financially.

[jambo]

Originally Posted by Mollers

They lied.



1.2m/ltr is good going and a 75hp 4st would struggle to do much better. Hang on to your money and put it towards upgrading the whole rig when the time comes. Re-powering rarely stacks-up financially.

For once I have to agree with Mollers completely.





Sent from my iPhone using RIB Net

[Pikey Dave]

Originally Posted by mctaggart

Hello

I am considering changing my current 2000 Mercury 75hp two stroke, (on my 5.4 metre ribtec) for a four stroke, purely because of the limiting factor of the amount of fuel it guzzles and the distance i wish to now go on it. It currently gets about 1.2miles per litre, however I am told i can expect to get double that on a more modern four stroke.

I have seen a 2004 Honda BF75 for sale for £1900 and it seems like it will be a straight swap with any luck. I was under the impression all the newish four strokes were fuel injected, but i am reading that this Honda may have carbs??

Can anyone shed any more light on this?

if it all checks out I am going to change to 4 stroke

Craig

It'll be carbed & you'll be disappointed

[mick]

My Honda 90 s roughly do 100 Nm to 130 L as a pair 4 persons up and they are carbs
As the others say save your brass

[mctaggart]

well now thats got me totally confused, all the spec sheets etc on fuel consumption per hour and other peoples examples i have read on other forums point to 4 strokes being much more efficient?

Does anyone on here run a similar sized 4 stroke single.

What sort of fuel economy do you get? if i am doing a run across the bristol channel i get a maximum of 1.2 miles litre, or if i am just normal ribbing its more like 1.0 litre an hour.

[Pikey Dave]

Originally Posted by mctaggart

well now thats got me totally confused, all the spec sheets etc on fuel consumption per hour and other peoples examples i have read on other forums point to 4 strokes being much more efficient?

Does anyone on here run a similar sized 4 stroke on a rib?

What sort of fuel economy do you get?

4 strokes had a period where they were better on fuel than the old tech carbed 2 strokes, but that was mostly in the time when 4 stroke went injected & 2 strokes were still "old tech". Then 2 strokes caught up with the introduction of DI, Ficht/Etec/HPDI etc. Now there's not much between 'em, but folks still fall for the "2 strokes are illegal" or "2 strokes use twice as much fuel" bollix. The 2 engines that you are comparing aren't a million miles apart, the early Hondas had problems with corrosion & I personally wouldn't chuck £1900 quid at a 10 year old one. How much fuel are you going to burn to make up £1900 quidsworth of difference? On top of that, the performance of the 75 Honda will be "pedestrian" at best. In the end it's your money, but you did ask

[Mollers]

Originally Posted by mctaggart

well now thats got me totally confused, all the spec sheets etc on fuel consumption per hour and other peoples examples i have read on other forums point to 4 strokes being much more efficient?

They are, but not double or anywhere near.

What you're proposing is a financial non-starter. You'd nowhere near see your money back in fuel saving or added resale value.

I know that you Welsh boys are tighter than submarine doors, but do the math man.

[mctaggart]

Looks like I am going to keep my money where it is then and just keep filling the greedy basdard instead

Ok new plan then, time to buy another fuel tank!

[two stroke mick]

There all greedy bastards.

[Mollers]

Originally Posted by two stroke mick

There all greedy bastards.

Whack the gas in, forget the cost and enjoy it. If the cost grips, get her sold. The less that you use the boat, the less value you're getting through ownership. :-)

[kerny]

Originally Posted by two stroke mick

There all greedy bastards.

[Locozodiac]

Mission Impossible to double your current 2 stroke consumption, expect 30, at most 35% less fuel consumption with same 4 stroke HP engine.

Happy Boating

[colcreate]

If this is your Ribtec & 75Merc on YouTube then you are going to be disappointed with the Honda's performance!

http://m.youtube.com/watch?v=uITq6KW81oE

[mctaggart]

Lol good investigating work Colcrete

Ha yes that is my Rib when we first bought it a couple of years ago, suffice to say we always wear life jackets and the kill cord after watching that back, got too caught up in the excitement of a new rib!

The engine sounds bloody awful in that video, i had it totally rebuilt not long after and it runs and sounds like a totally different machine, much more smooth quiter, that video it just sounds plain nasty lol!

Hmmmm i am past the two stroke performance now, i just want to increase the MPG, reliability and not have to buy bloody two stroke all the time. :0

[mk1custom]

Go with the Honda!
you'll be very surprised how economical the hondas are even the carbed ones!
I went from a 50 merc 2 Stoke to a Honda bf50 on carbs savings money by the minute!
The comments about not making your 1900 quid back??
Thats true if your planning on keeping your old motor too????
You won't! Be disappointed with performance there will be bucket loads of torque on tap!!

[A1an]

Going by your style of driving I'd stick with what you have.

[Pikey Dave]

Originally Posted by mk1custom

......... there will be bucket loads of torque on tap!!

Really?

[mick]

Originally Posted by mk1custom

Go with the Honda!

you'll be very surprised how economical the hondas are even the carbed ones!

I went from a 50 merc 2 Stoke to a Honda bf50 on carbs savings money by the minute!

The comments about not making your 1900 quid back??

Thats true if your planning on keeping your old motor too????

You won't! Be disappointed with performance there will be bucket loads of torque on tap!!

Are you sure if you want Grunt get a 2 smoke

[mctaggart]

This is what i thought too, can probably get £17-1800 for my two stroke Mercury, seen another honda 2006 for £2600 for sale today. So £800 difference plus i get an engine that is 6 years newer!

Swings and roundabouts though as I might just change the whole rig if I am going to the effort of spending that.

Well at least i know my options now, thanks for all your comments.

Originally Posted by mk1custom

Go with the Honda!
you'll be very surprised how economical the hondas are even the carbed ones!
I went from a 50 merc 2 Stoke to a Honda bf50 on carbs savings money by the minute!
The comments about not making your 1900 quid back??
Thats true if your planning on keeping your old motor too????
You won't! Be disappointed with performance there will be bucket loads of torque on tap!!